Improvement in ratchet and pawl



tniied iatea JOHN u. DunRAN, OF AURORA, ILLINOIS, AssIGN'oR To HIMSELFANDWI'I@y 'LIAM LOMBARD, OE BROOKLYN, NEW YORK.

Letters Patent No. 100,510, dated March 8,1870; unter/lated February 26,18,70. Y

IMPROVEMENT IN RA'rcErET AND PAWL.

. l The Schedulerefen'ed to in these Letters Patent and making part othe same.

, To all whom itmayxconcern Be it known that I, J onN H. DUnRAN, of'Aurora, in the county of Kane, and State of'lllinois, have invented anew and improved 'Ratchet and Pawl; and

I4 do hereby declare that the'following is a full, clear, 4

and exactfdescription thereof, which will enable others skilled in vtheart to make and use the same, referencev `beiuglhad to theaccompanying-drawing forming part `The object of this invention is toiprevent the end of' apawl from working on the edge of a ratchet# wheel,and from thereby wearing ott' the contiguous surfaces while the pawlslips or works loose, on the ratchet.

The invention consists in providing the pawl with spring clamps, bywhich itis held laway from the edge vof -t-he ratchet-wheel, tso as notto wear the same, as

hereinafter more fully described.

A, in the drawing, represents a ratchet-wheel, ar-

` `ranged on a yshaft or other part of a suitable mechanism ormachinery. A

-Bis apawl, pivoted by a pin, a, to a pulley, C, or other suitable partofthe machinery or mechanism.

.'lo the sides of the pawl are'secured arms b b, that project toward theratchelwheel, and tit over the faces of the same, as shown.` These armshave sniieient spring power to press against the. sides or faces oftheratchet-wheel. Y i y When the ratchet-wheel is turned in the directionof` the arrowvl it tends to carry the ends of the arms b in the samedirect-ion, and swings thereby t-he pawl off its edge, and retains itthus as long as it is turned inthis direction. The end of the pawl will,therefore,

not fit against'the edge of the ratchet-wheel, while the same is free tomove, and does not Wear on the edge. As soon, however, as the motion ofthe ratchet-.wheel is reversed into the direction of the arrow 2, theends of the arms b are carried in the same direction, and draw therebythe pawl against the edge of the wheel, to prevent further turning ofthe latter in the z'said direction, as is indicated by red lines in ig.l.

In oase the ratchetwhcel is stationary, and the de vice C carrying thepawl is'revolved, the action is the same. If C is turned in thedirection ofthe arrow 3, drawing the pawl back toward its pivot, thearms b will be drawn out, and will keep the pawl away from theedge ofthe ratchet-wheel as long as C is Vthus turned. Whem however, the'motion is reversed into the vdirection ofthe arrow 4 the pawl will beforced against the ratchet-wheel, and will prevent further. turning inthe said direction.

` In some cases,paud when the material is of good quality, onesingle-arm b may be suiicient to produce the requisite friction on theratchetewheel for keeping the pawl away from the Same.

This invention can be applied to all kinds of machinery, and willproduce a considerable saving in pawls and ratchet-wheels, as-theirrapid wearing is prevented.

Having thus described my invention,

What I claim as new, and desire to secure byALetters Patent, is-

The combination with a ratchet-wheel and pawl, of the single or doublespring clampshown and described.

'lhe above speoication of my invention signed by me' this 9th day ofFebruary, i869. l

JOHN H. DU'RRAN.

Vli'tuesses:4

JAMEs- D. FOX, J. E. BAYLES.

